How Do Sponges Protect Themselves?

Answer

Sponges protect themselves by hard spikes throughout their body. Some of these spikes are like needles, and others contains chemicals that either taste bad or are poisonous. Some sponges also release chemicals into their environment to protect themselves. You can find more information here: http://www.wildsingapore.com/wildfacts/porifera/fngporifera.htm
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